Certain chiral liquid crystals confined to quasi-two-dimensional curved shells (cholesteric shells) support topological phases that are absent in flat geometries.

From the article:

Cholesteric Shells: Two-Dimensional Blue Fog and Finite Quasicrystals
L. N. Carenza, G. Gonnella, D. Marenduzzo, G. Negro, and E. Orlandini
Phys. Rev. Lett. 128, 027801 (2022)

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